APA (7th ed.) Citation

Copp, G. F. (1929). Progressive seasonal variation in time series.

Chicago Style (17th ed.) Citation

Copp, George Frederic. Progressive Seasonal Variation in Time Series. 1929.

MLA (9th ed.) Citation

Copp, George Frederic. Progressive Seasonal Variation in Time Series. 1929.

Warning: These citations may not always be 100% accurate.